Video: Actor Isaac Lamb's lip-dub proposal to Amy Frankel

Portland actor Isaac Lamb, stunned his girlfriend Amy Frankel with the "best marriage proposal ever." He gathered a crowd of friends and family for an elaborate proposal involving a live lip-synced performance of Bruno Mars' song "Marry Me."

Shaking hands with someone

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Huff Post reports that a small crowd of about 60 people staged a choreography parade down a quiet Portland street with the bride-to-be in the open back of a Honda CRV.

According to Oregon Live, Lamb, 31, said he likes to put on "big flashmobby type things." He said, "When I decided to ask Amy to marry me, I wanted something she wouldn't forget."

The bride-to-be, Amy Frankel, 33, said: "I was completely floored. We had talked about wanting to get married, but I never would have expected that in a million years."

Oregon Live reports Lamb explained the plan, admitting that, "I knew there was very little chance to do this without her knowing what was going on. My goal was just to get her to the house."

The surprise proposal began with Lamb's brother asking Frankel to sit in the car. He gave her headphones and told her she would hear a song.

Frankel obeyed and after the car began moving down the street, two friends of Frankel and Lamb appeared. Frankel said she thought, "How sweet, they're going to do a show for me." But as the car moved slowly down the street, more people appeared, including Lamb's parents!

Frankel said when she heard the song "Marry You," by Grammy winner Bruno Mars, she knew what it was all about.

Lamb soon appeared through the crowd and got down on his knee and proposed to his sweetheart. When asked whether he had any doubt that she would say yes, Lamb answered, "Not a one. This whole production was a good insurance policy."

Daily Mail reports that the YouTube video of the proposal was an instant online hit having received more than 700,000 views. According to Daily Mail, Lamb admitted the popularity of the video was "crazy." He said: "I thought friends and family would like it, and I figured that's where it would end. I can't believe it. It's crazy."

A camera behind Frankel captured the performance, while another captured her stunned reaction to the elaborate performance.

Lamb, according to Oregon Live, starred in "Defending the Caveman." He studied film production at the Loyola Marymount University. According to Oregon Live, the two met at an audition for the "West Side Story" at Portland Center Stage. Frankel got the part, Lamb didn't.

Frankel is a former Broadway dancer who has choreographed several shows in Portland, including Portland Opera's recent "Candide," Oregon Live reports.

The two plan to marry in a year. Frankel said: "One of reasons I love him, he's such a fun-loving guy. He has such a big heart. He loves celebrating life and the friendships that we have. Our lives are going to be like this."